Towel bar



FIG. 1 is a left side, top and front perspective view of a towel bar showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a bottom plan view thereof; and,

FIG. 5 is a rear elevational ivew thereof. 

The ornamental design for a towel bar, as shown and described. 